Question

The molecular formula of purine is:

• A. C₅H₄N₄
• B. C₆H₅N₃
• C. C₇H₆N₂
• D. C₄H₃N₂

Answer 1

The Correct Option is A

Purine is a key component in many biological systems, most notably as part of the structure of DNA and RNA where it pairs with pyrimidines to form base pairs. The molecular formula of purine is C_5H_4N_4.

1. Purine is a heterocyclic aromatic compound that consists of a pyrimidine ring fused with an imidazole ring. Due to this complex structure, it contains a total of 5 carbon (C) atoms, 4 hydrogen (H) atoms, and 4 nitrogen (N) atoms.
2. The options given are:
   • C₅H₄N₄: This is the correct molecular formula for purine, reflecting its structure and atom composition accurately.
   • C₆H₅N₃, C₇H₆N₂, and C₄H₃N₂ are incorrect as they do not match the atom balance required for purine.
3. The correct understanding of purine's molecular structure is crucial as it is foundational in understanding nucleic acids' biochemistry.
4. Based on the options and understanding of molecular chemistry, option C₅H₄N₄ is confirmed as correct.

In summary, purine has the molecular formula C_5H_4N_4. This formula is crucial for understanding its role and functioning within nucleic acids.